The MetaCyc database of metabolic pathways and enzymes - a 2019 update.
Ron CaspiRichard BillingtonIngrid M. KeselerAnamika KothariMarkus KrummenackerPeter E. MidfordWai Kit OngSuzanne M. PaleyPallavi SubhravetiPeter D. KarpPublished in: Nucleic Acids Res. (2020)